STRAIGHT TALK BYOP NOKIA 635 WINDOWS APN SETTINGS How to change apn settings an AT&T windows phone.
After playing with the settings for a bit, I finally found the correct APN & MMS settings on my phone, so now I can both send and receive pictures with really fast .
This is the apn settings for the Nokia Lumia 520 under straight talk on the att sim card. This is for the new sim cards that they have came out with for the 4g lte .